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Finding the Fourth Proportional to 970.42, 1,339.17 and 528.31

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Solution

The fourth proportional to 970.42, 1,339.17 and 528.31 is: 729.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.42 : 1,339.17 = 528.31 : x
  2. Step 2: Convert to fraction form
    970.42/1,339.17 = 528.31/x
  3. Step 3: Cross multiply
    970.42x = 1,339.17 × 528.31
  4. Step 4: Simplify right side
    970.42x = 707,496.90
  5. Step 5: Solve for x
    x = 707,496.90/970.42
  6. Step 6: Final answer
    x = 729.06

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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.