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Finding the Fourth Proportional to 917,652.80, 1,376,479.20 and 286,630.40

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Solution

The fourth proportional to 917,652.80, 1,376,479.20 and 286,630.40 is: 429,945.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    917,652.80 : 1,376,479.20 = 286,630.40 : x
  2. Step 2: Convert to fraction form
    917,652.80/1,376,479.20 = 286,630.40/x
  3. Step 3: Cross multiply
    917,652.80x = 1,376,479.20 × 286,630.40
  4. Step 4: Simplify right side
    917,652.80x = 394,540,783,687.68
  5. Step 5: Solve for x
    x = 394,540,783,687.68/917,652.80
  6. Step 6: Final answer
    x = 429,945.60

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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.