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Finding the Fourth Proportional to 390,692.85, 585,280.98 and 287,923.53

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Solution

The fourth proportional to 390,692.85, 585,280.98 and 287,923.53 is: 431,326.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,692.85 : 585,280.98 = 287,923.53 : x
  2. Step 2: Convert to fraction form
    390,692.85/585,280.98 = 287,923.53/x
  3. Step 3: Cross multiply
    390,692.85x = 585,280.98 × 287,923.53
  4. Step 4: Simplify right side
    390,692.85x = 168,516,167,775.92
  5. Step 5: Solve for x
    x = 168,516,167,775.92/390,692.85
  6. Step 6: Final answer
    x = 431,326.47

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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.