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Finding the Fourth Proportional to 970.71, 1,339.58 and 528.61

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Solution

The fourth proportional to 970.71, 1,339.58 and 528.61 is: 729.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.71 : 1,339.58 = 528.61 : x
  2. Step 2: Convert to fraction form
    970.71/1,339.58 = 528.61/x
  3. Step 3: Cross multiply
    970.71x = 1,339.58 × 528.61
  4. Step 4: Simplify right side
    970.71x = 708,115.38
  5. Step 5: Solve for x
    x = 708,115.38/970.71
  6. Step 6: Final answer
    x = 729.49

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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.