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Finding the Fourth Proportional to 870.14, 1,192.74 and 858.47

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Solution

The fourth proportional to 870.14, 1,192.74 and 858.47 is: 1,176.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.14 : 1,192.74 = 858.47 : x
  2. Step 2: Convert to fraction form
    870.14/1,192.74 = 858.47/x
  3. Step 3: Cross multiply
    870.14x = 1,192.74 × 858.47
  4. Step 4: Simplify right side
    870.14x = 1,023,925.54
  5. Step 5: Solve for x
    x = 1,023,925.54/870.14
  6. Step 6: Final answer
    x = 1,176.74

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.