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Finding the Fourth Proportional to 860,145.80, 1,290,373.95 and 354,430.40

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Solution

The fourth proportional to 860,145.80, 1,290,373.95 and 354,430.40 is: 531,709.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,145.80 : 1,290,373.95 = 354,430.40 : x
  2. Step 2: Convert to fraction form
    860,145.80/1,290,373.95 = 354,430.40/x
  3. Step 3: Cross multiply
    860,145.80x = 1,290,373.95 × 354,430.40
  4. Step 4: Simplify right side
    860,145.80x = 457,347,755,248.08
  5. Step 5: Solve for x
    x = 457,347,755,248.08/860,145.80
  6. Step 6: Final answer
    x = 531,709.57

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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.