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Finding the Fourth Proportional to 631.72, 869.70 and 570.16

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Solution

The fourth proportional to 631.72, 869.70 and 570.16 is: 784.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.72 : 869.70 = 570.16 : x
  2. Step 2: Convert to fraction form
    631.72/869.70 = 570.16/x
  3. Step 3: Cross multiply
    631.72x = 869.70 × 570.16
  4. Step 4: Simplify right side
    631.72x = 495,868.15
  5. Step 5: Solve for x
    x = 495,868.15/631.72
  6. Step 6: Final answer
    x = 784.95

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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.