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Finding the Fourth Proportional to 830.18, 1,247.55 and 776

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Solution

The fourth proportional to 830.18, 1,247.55 and 776 is: 1,166.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.18 : 1,247.55 = 776 : x
  2. Step 2: Convert to fraction form
    830.18/1,247.55 = 776/x
  3. Step 3: Cross multiply
    830.18x = 1,247.55 × 776
  4. Step 4: Simplify right side
    830.18x = 968,098.80
  5. Step 5: Solve for x
    x = 968,098.80/830.18
  6. Step 6: Final answer
    x = 1,166.13

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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.