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Finding the Fourth Proportional to 750.61, 1,120.50 and 716.91

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Solution

The fourth proportional to 750.61, 1,120.50 and 716.91 is: 1,070.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.61 : 1,120.50 = 716.91 : x
  2. Step 2: Convert to fraction form
    750.61/1,120.50 = 716.91/x
  3. Step 3: Cross multiply
    750.61x = 1,120.50 × 716.91
  4. Step 4: Simplify right side
    750.61x = 803,296.16
  5. Step 5: Solve for x
    x = 803,296.16/750.61
  6. Step 6: Final answer
    x = 1,070.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.