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Finding the Fourth Proportional to 830.98, 1,152.13 and 781.30

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Solution

The fourth proportional to 830.98, 1,152.13 and 781.30 is: 1,083.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.98 : 1,152.13 = 781.30 : x
  2. Step 2: Convert to fraction form
    830.98/1,152.13 = 781.30/x
  3. Step 3: Cross multiply
    830.98x = 1,152.13 × 781.30
  4. Step 4: Simplify right side
    830.98x = 900,159.17
  5. Step 5: Solve for x
    x = 900,159.17/830.98
  6. Step 6: Final answer
    x = 1,083.25

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.