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Finding the Fourth Proportional to 855.52, 1,281.76 and 530.40

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Solution

The fourth proportional to 855.52, 1,281.76 and 530.40 is: 794.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.52 : 1,281.76 = 530.40 : x
  2. Step 2: Convert to fraction form
    855.52/1,281.76 = 530.40/x
  3. Step 3: Cross multiply
    855.52x = 1,281.76 × 530.40
  4. Step 4: Simplify right side
    855.52x = 679,845.50
  5. Step 5: Solve for x
    x = 679,845.50/855.52
  6. Step 6: Final answer
    x = 794.66

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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.