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Finding the Fourth Proportional to 714.95, 1,071.02 and 405.87

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Solution

The fourth proportional to 714.95, 1,071.02 and 405.87 is: 608.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.95 : 1,071.02 = 405.87 : x
  2. Step 2: Convert to fraction form
    714.95/1,071.02 = 405.87/x
  3. Step 3: Cross multiply
    714.95x = 1,071.02 × 405.87
  4. Step 4: Simplify right side
    714.95x = 434,692.86
  5. Step 5: Solve for x
    x = 434,692.86/714.95
  6. Step 6: Final answer
    x = 608.01

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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.