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Finding the Fourth Proportional to 718.24, 1,075.18 and 649.78

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Solution

The fourth proportional to 718.24, 1,075.18 and 649.78 is: 972.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.24 : 1,075.18 = 649.78 : x
  2. Step 2: Convert to fraction form
    718.24/1,075.18 = 649.78/x
  3. Step 3: Cross multiply
    718.24x = 1,075.18 × 649.78
  4. Step 4: Simplify right side
    718.24x = 698,630.46
  5. Step 5: Solve for x
    x = 698,630.46/718.24
  6. Step 6: Final answer
    x = 972.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.