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Finding the Fourth Proportional to 973.28, 1,343.20 and 624.72

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Solution

The fourth proportional to 973.28, 1,343.20 and 624.72 is: 862.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.28 : 1,343.20 = 624.72 : x
  2. Step 2: Convert to fraction form
    973.28/1,343.20 = 624.72/x
  3. Step 3: Cross multiply
    973.28x = 1,343.20 × 624.72
  4. Step 4: Simplify right side
    973.28x = 839,123.90
  5. Step 5: Solve for x
    x = 839,123.90/973.28
  6. Step 6: Final answer
    x = 862.16

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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.