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Finding the Fourth Proportional to 717,903.36, 990,693.76 and 391,219.20

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Solution

The fourth proportional to 717,903.36, 990,693.76 and 391,219.20 is: 539,875.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,903.36 : 990,693.76 = 391,219.20 : x
  2. Step 2: Convert to fraction form
    717,903.36/990,693.76 = 391,219.20/x
  3. Step 3: Cross multiply
    717,903.36x = 990,693.76 × 391,219.20
  4. Step 4: Simplify right side
    717,903.36x = 387,578,420,232.19
  5. Step 5: Solve for x
    x = 387,578,420,232.19/717,903.36
  6. Step 6: Final answer
    x = 539,875.48

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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.