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Finding the Fourth Proportional to 612,080.80, 918,121.20 and 280,304.80

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Solution

The fourth proportional to 612,080.80, 918,121.20 and 280,304.80 is: 420,457.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,080.80 : 918,121.20 = 280,304.80 : x
  2. Step 2: Convert to fraction form
    612,080.80/918,121.20 = 280,304.80/x
  3. Step 3: Cross multiply
    612,080.80x = 918,121.20 × 280,304.80
  4. Step 4: Simplify right side
    612,080.80x = 257,353,779,341.76
  5. Step 5: Solve for x
    x = 257,353,779,341.76/612,080.80
  6. Step 6: Final answer
    x = 420,457.20

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Similar ratio
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1.5x scale

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.