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Finding the Fourth Proportional to 691.45, 953.12 and 470.01

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Solution

The fourth proportional to 691.45, 953.12 and 470.01 is: 647.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.45 : 953.12 = 470.01 : x
  2. Step 2: Convert to fraction form
    691.45/953.12 = 470.01/x
  3. Step 3: Cross multiply
    691.45x = 953.12 × 470.01
  4. Step 4: Simplify right side
    691.45x = 447,978.04
  5. Step 5: Solve for x
    x = 447,978.04/691.45
  6. Step 6: Final answer
    x = 647.88

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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.