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Finding the Fourth Proportional to 687.15, 947.52 and 465.66

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Solution

The fourth proportional to 687.15, 947.52 and 465.66 is: 642.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.15 : 947.52 = 465.66 : x
  2. Step 2: Convert to fraction form
    687.15/947.52 = 465.66/x
  3. Step 3: Cross multiply
    687.15x = 947.52 × 465.66
  4. Step 4: Simplify right side
    687.15x = 441,222.16
  5. Step 5: Solve for x
    x = 441,222.16/687.15
  6. Step 6: Final answer
    x = 642.10

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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.