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Finding the Fourth Proportional to 870.19, 1,304.16 and 664

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Solution

The fourth proportional to 870.19, 1,304.16 and 664 is: 995.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.19 : 1,304.16 = 664 : x
  2. Step 2: Convert to fraction form
    870.19/1,304.16 = 664/x
  3. Step 3: Cross multiply
    870.19x = 1,304.16 × 664
  4. Step 4: Simplify right side
    870.19x = 865,962.24
  5. Step 5: Solve for x
    x = 865,962.24/870.19
  6. Step 6: Final answer
    x = 995.14

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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.