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Finding the Fourth Proportional to 985.50, 1,479.02 and 870.17

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Solution

The fourth proportional to 985.50, 1,479.02 and 870.17 is: 1,305.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.50 : 1,479.02 = 870.17 : x
  2. Step 2: Convert to fraction form
    985.50/1,479.02 = 870.17/x
  3. Step 3: Cross multiply
    985.50x = 1,479.02 × 870.17
  4. Step 4: Simplify right side
    985.50x = 1,286,987.09
  5. Step 5: Solve for x
    x = 1,286,987.09/985.50
  6. Step 6: Final answer
    x = 1,305.92

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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.