Home / 670,680.39-1,006,020.59-390,000.81

Finding the Fourth Proportional to 670,680.39, 1,006,020.59 and 390,000.81

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Solution

The fourth proportional to 670,680.39, 1,006,020.59 and 390,000.81 is: 585,001.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    670,680.39 : 1,006,020.59 = 390,000.81 : x
  2. Step 2: Convert to fraction form
    670,680.39/1,006,020.59 = 390,000.81/x
  3. Step 3: Cross multiply
    670,680.39x = 1,006,020.59 × 390,000.81
  4. Step 4: Simplify right side
    670,680.39x = 392,348,844,976.68
  5. Step 5: Solve for x
    x = 392,348,844,976.68/670,680.39
  6. Step 6: Final answer
    x = 585,001.22

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Double scale
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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.