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Finding the Fourth Proportional to 385,680.80, 578,521.20 and 136,330.40

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Solution

The fourth proportional to 385,680.80, 578,521.20 and 136,330.40 is: 204,495.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,680.80 : 578,521.20 = 136,330.40 : x
  2. Step 2: Convert to fraction form
    385,680.80/578,521.20 = 136,330.40/x
  3. Step 3: Cross multiply
    385,680.80x = 578,521.20 × 136,330.40
  4. Step 4: Simplify right side
    385,680.80x = 78,870,026,604.48
  5. Step 5: Solve for x
    x = 78,870,026,604.48/385,680.80
  6. Step 6: Final answer
    x = 204,495.60

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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.