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Finding the Fourth Proportional to 870.18, 1,200.51 and 555.65

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Solution

The fourth proportional to 870.18, 1,200.51 and 555.65 is: 766.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.18 : 1,200.51 = 555.65 : x
  2. Step 2: Convert to fraction form
    870.18/1,200.51 = 555.65/x
  3. Step 3: Cross multiply
    870.18x = 1,200.51 × 555.65
  4. Step 4: Simplify right side
    870.18x = 667,063.38
  5. Step 5: Solve for x
    x = 667,063.38/870.18
  6. Step 6: Final answer
    x = 766.58

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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.