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Finding the Fourth Proportional to 999.10, 1,498.65 and 391.10

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Solution

The fourth proportional to 999.10, 1,498.65 and 391.10 is: 586.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.10 : 1,498.65 = 391.10 : x
  2. Step 2: Convert to fraction form
    999.10/1,498.65 = 391.10/x
  3. Step 3: Cross multiply
    999.10x = 1,498.65 × 391.10
  4. Step 4: Simplify right side
    999.10x = 586,122.02
  5. Step 5: Solve for x
    x = 586,122.02/999.10
  6. Step 6: Final answer
    x = 586.65

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Half scale
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Double scale
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Similar ratio
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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.