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Finding the Fourth Proportional to 870.51, 1,305.24 and 578.16

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Solution

The fourth proportional to 870.51, 1,305.24 and 578.16 is: 866.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.51 : 1,305.24 = 578.16 : x
  2. Step 2: Convert to fraction form
    870.51/1,305.24 = 578.16/x
  3. Step 3: Cross multiply
    870.51x = 1,305.24 × 578.16
  4. Step 4: Simplify right side
    870.51x = 754,644.62
  5. Step 5: Solve for x
    x = 754,644.62/870.51
  6. Step 6: Final answer
    x = 866.90

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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.