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Finding the Fourth Proportional to 1,145.81, 1,581.26 and 703.69

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Solution

The fourth proportional to 1,145.81, 1,581.26 and 703.69 is: 971.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.81 : 1,581.26 = 703.69 : x
  2. Step 2: Convert to fraction form
    1,145.81/1,581.26 = 703.69/x
  3. Step 3: Cross multiply
    1,145.81x = 1,581.26 × 703.69
  4. Step 4: Simplify right side
    1,145.81x = 1,112,709.38
  5. Step 5: Solve for x
    x = 1,112,709.38/1,145.81
  6. Step 6: Final answer
    x = 971.11

Related Problems

Find fourth proportional to 572.91, 790.63 and 351.84
Half scale
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Double scale
Find fourth proportional to 1,146.81, 1,582.64 and 704.69
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.