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Finding the Fourth Proportional to 870.98, 1,199.57 and 684.18

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Solution

The fourth proportional to 870.98, 1,199.57 and 684.18 is: 942.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.98 : 1,199.57 = 684.18 : x
  2. Step 2: Convert to fraction form
    870.98/1,199.57 = 684.18/x
  3. Step 3: Cross multiply
    870.98x = 1,199.57 × 684.18
  4. Step 4: Simplify right side
    870.98x = 820,718.38
  5. Step 5: Solve for x
    x = 820,718.38/870.98
  6. Step 6: Final answer
    x = 942.30

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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.