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Finding the Fourth Proportional to 687.02, 947.31 and 500.18

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Solution

The fourth proportional to 687.02, 947.31 and 500.18 is: 689.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.02 : 947.31 = 500.18 : x
  2. Step 2: Convert to fraction form
    687.02/947.31 = 500.18/x
  3. Step 3: Cross multiply
    687.02x = 947.31 × 500.18
  4. Step 4: Simplify right side
    687.02x = 473,825.52
  5. Step 5: Solve for x
    x = 473,825.52/687.02
  6. Step 6: Final answer
    x = 689.68

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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.