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Finding the Fourth Proportional to 612,811.30, 918,232.80 and 577,381.90

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Solution

The fourth proportional to 612,811.30, 918,232.80 and 577,381.90 is: 865,145.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,811.30 : 918,232.80 = 577,381.90 : x
  2. Step 2: Convert to fraction form
    612,811.30/918,232.80 = 577,381.90/x
  3. Step 3: Cross multiply
    612,811.30x = 918,232.80 × 577,381.90
  4. Step 4: Simplify right side
    612,811.30x = 530,170,998,706.32
  5. Step 5: Solve for x
    x = 530,170,998,706.32/612,811.30
  6. Step 6: Final answer
    x = 865,145.60

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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.