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Finding the Fourth Proportional to 717,673.92, 990,378.40 and 390,990.84

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Solution

The fourth proportional to 717,673.92, 990,378.40 and 390,990.84 is: 539,561.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,673.92 : 990,378.40 = 390,990.84 : x
  2. Step 2: Convert to fraction form
    717,673.92/990,378.40 = 390,990.84/x
  3. Step 3: Cross multiply
    717,673.92x = 990,378.40 × 390,990.84
  4. Step 4: Simplify right side
    717,673.92x = 387,228,882,460.67
  5. Step 5: Solve for x
    x = 387,228,882,460.67/717,673.92
  6. Step 6: Final answer
    x = 539,561.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.