Home / 1,117.19-1,541.58-638.63

Finding the Fourth Proportional to 1,117.19, 1,541.58 and 638.63

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Solution

The fourth proportional to 1,117.19, 1,541.58 and 638.63 is: 881.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.19 : 1,541.58 = 638.63 : x
  2. Step 2: Convert to fraction form
    1,117.19/1,541.58 = 638.63/x
  3. Step 3: Cross multiply
    1,117.19x = 1,541.58 × 638.63
  4. Step 4: Simplify right side
    1,117.19x = 984,499.24
  5. Step 5: Solve for x
    x = 984,499.24/1,117.19
  6. Step 6: Final answer
    x = 881.23

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Half scale
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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.