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Finding the Fourth Proportional to 780.98, 1,077.28 and 501.12

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Solution

The fourth proportional to 780.98, 1,077.28 and 501.12 is: 691.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.98 : 1,077.28 = 501.12 : x
  2. Step 2: Convert to fraction form
    780.98/1,077.28 = 501.12/x
  3. Step 3: Cross multiply
    780.98x = 1,077.28 × 501.12
  4. Step 4: Simplify right side
    780.98x = 539,846.55
  5. Step 5: Solve for x
    x = 539,846.55/780.98
  6. Step 6: Final answer
    x = 691.24

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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.