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Finding the Fourth Proportional to 970.78, 1,339.71 and 528.72

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Solution

The fourth proportional to 970.78, 1,339.71 and 528.72 is: 729.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.78 : 1,339.71 = 528.72 : x
  2. Step 2: Convert to fraction form
    970.78/1,339.71 = 528.72/x
  3. Step 3: Cross multiply
    970.78x = 1,339.71 × 528.72
  4. Step 4: Simplify right side
    970.78x = 708,331.47
  5. Step 5: Solve for x
    x = 708,331.47/970.78
  6. Step 6: Final answer
    x = 729.65

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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.