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Finding the Fourth Proportional to 781.46, 1,075.95 and 648.14

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Solution

The fourth proportional to 781.46, 1,075.95 and 648.14 is: 892.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.46 : 1,075.95 = 648.14 : x
  2. Step 2: Convert to fraction form
    781.46/1,075.95 = 648.14/x
  3. Step 3: Cross multiply
    781.46x = 1,075.95 × 648.14
  4. Step 4: Simplify right side
    781.46x = 697,366.23
  5. Step 5: Solve for x
    x = 697,366.23/781.46
  6. Step 6: Final answer
    x = 892.39

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1.5x scale

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.