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Finding the Fourth Proportional to 756.63, 1,130.08 and 647.31

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Solution

The fourth proportional to 756.63, 1,130.08 and 647.31 is: 966.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.63 : 1,130.08 = 647.31 : x
  2. Step 2: Convert to fraction form
    756.63/1,130.08 = 647.31/x
  3. Step 3: Cross multiply
    756.63x = 1,130.08 × 647.31
  4. Step 4: Simplify right side
    756.63x = 731,510.47
  5. Step 5: Solve for x
    x = 731,510.47/756.63
  6. Step 6: Final answer
    x = 966.80

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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.