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Finding the Fourth Proportional to 1,117.98, 1,542.20 and 698.18

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Solution

The fourth proportional to 1,117.98, 1,542.20 and 698.18 is: 963.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.98 : 1,542.20 = 698.18 : x
  2. Step 2: Convert to fraction form
    1,117.98/1,542.20 = 698.18/x
  3. Step 3: Cross multiply
    1,117.98x = 1,542.20 × 698.18
  4. Step 4: Simplify right side
    1,117.98x = 1,076,721.99
  5. Step 5: Solve for x
    x = 1,076,721.99/1,117.98
  6. Step 6: Final answer
    x = 963.10

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Half scale
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Double scale
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1.5x scale

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.