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Finding the Fourth Proportional to 878.71, 1,314.87 and 530.77

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Solution

The fourth proportional to 878.71, 1,314.87 and 530.77 is: 794.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.71 : 1,314.87 = 530.77 : x
  2. Step 2: Convert to fraction form
    878.71/1,314.87 = 530.77/x
  3. Step 3: Cross multiply
    878.71x = 1,314.87 × 530.77
  4. Step 4: Simplify right side
    878.71x = 697,893.55
  5. Step 5: Solve for x
    x = 697,893.55/878.71
  6. Step 6: Final answer
    x = 794.23

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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.