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Finding the Fourth Proportional to 611,520.40, 917,280.60 and 328,085.20

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Solution

The fourth proportional to 611,520.40, 917,280.60 and 328,085.20 is: 492,127.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,520.40 : 917,280.60 = 328,085.20 : x
  2. Step 2: Convert to fraction form
    611,520.40/917,280.60 = 328,085.20/x
  3. Step 3: Cross multiply
    611,520.40x = 917,280.60 × 328,085.20
  4. Step 4: Simplify right side
    611,520.40x = 300,946,189,107.12
  5. Step 5: Solve for x
    x = 300,946,189,107.12/611,520.40
  6. Step 6: Final answer
    x = 492,127.80

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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.