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Finding the Fourth Proportional to 1,087.65, 1,624.20 and 853.92

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Solution

The fourth proportional to 1,087.65, 1,624.20 and 853.92 is: 1,275.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.65 : 1,624.20 = 853.92 : x
  2. Step 2: Convert to fraction form
    1,087.65/1,624.20 = 853.92/x
  3. Step 3: Cross multiply
    1,087.65x = 1,624.20 × 853.92
  4. Step 4: Simplify right side
    1,087.65x = 1,386,936.86
  5. Step 5: Solve for x
    x = 1,386,936.86/1,087.65
  6. Step 6: Final answer
    x = 1,275.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.