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Finding the Fourth Proportional to 778.77, 1,074.87 and 530.10

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Solution

The fourth proportional to 778.77, 1,074.87 and 530.10 is: 731.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.77 : 1,074.87 = 530.10 : x
  2. Step 2: Convert to fraction form
    778.77/1,074.87 = 530.10/x
  3. Step 3: Cross multiply
    778.77x = 1,074.87 × 530.10
  4. Step 4: Simplify right side
    778.77x = 569,788.59
  5. Step 5: Solve for x
    x = 569,788.59/778.77
  6. Step 6: Final answer
    x = 731.65

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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.