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Finding the Fourth Proportional to 1,125.66, 1,688.40 and 345.63

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Solution

The fourth proportional to 1,125.66, 1,688.40 and 345.63 is: 518.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.66 : 1,688.40 = 345.63 : x
  2. Step 2: Convert to fraction form
    1,125.66/1,688.40 = 345.63/x
  3. Step 3: Cross multiply
    1,125.66x = 1,688.40 × 345.63
  4. Step 4: Simplify right side
    1,125.66x = 583,561.69
  5. Step 5: Solve for x
    x = 583,561.69/1,125.66
  6. Step 6: Final answer
    x = 518.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.