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Finding the Fourth Proportional to 971.65, 1,340.87 and 529.55

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Solution

The fourth proportional to 971.65, 1,340.87 and 529.55 is: 730.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.65 : 1,340.87 = 529.55 : x
  2. Step 2: Convert to fraction form
    971.65/1,340.87 = 529.55/x
  3. Step 3: Cross multiply
    971.65x = 1,340.87 × 529.55
  4. Step 4: Simplify right side
    971.65x = 710,048.36
  5. Step 5: Solve for x
    x = 710,048.36/971.65
  6. Step 6: Final answer
    x = 730.77

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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.