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Finding the Fourth Proportional to 989.77, 1,484.55 and 365.17

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Solution

The fourth proportional to 989.77, 1,484.55 and 365.17 is: 547.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.77 : 1,484.55 = 365.17 : x
  2. Step 2: Convert to fraction form
    989.77/1,484.55 = 365.17/x
  3. Step 3: Cross multiply
    989.77x = 1,484.55 × 365.17
  4. Step 4: Simplify right side
    989.77x = 542,113.12
  5. Step 5: Solve for x
    x = 542,113.12/989.77
  6. Step 6: Final answer
    x = 547.72

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Double scale
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1.5x scale

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.