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Finding the Fourth Proportional to 718,031.60, 990,843.18 and 395,740.72

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Solution

The fourth proportional to 718,031.60, 990,843.18 and 395,740.72 is: 546,099.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,031.60 : 990,843.18 = 395,740.72 : x
  2. Step 2: Convert to fraction form
    718,031.60/990,843.18 = 395,740.72/x
  3. Step 3: Cross multiply
    718,031.60x = 990,843.18 × 395,740.72
  4. Step 4: Simplify right side
    718,031.60x = 392,116,993,460.29
  5. Step 5: Solve for x
    x = 392,116,993,460.29/718,031.60
  6. Step 6: Final answer
    x = 546,099.91

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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.