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Finding the Fourth Proportional to 717,538.70, 990,191.30 and 395,278.94

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Solution

The fourth proportional to 717,538.70, 990,191.30 and 395,278.94 is: 545,478.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,538.70 : 990,191.30 = 395,278.94 : x
  2. Step 2: Convert to fraction form
    717,538.70/990,191.30 = 395,278.94/x
  3. Step 3: Cross multiply
    717,538.70x = 990,191.30 × 395,278.94
  4. Step 4: Simplify right side
    717,538.70x = 391,401,767,461.22
  5. Step 5: Solve for x
    x = 391,401,767,461.22/717,538.70
  6. Step 6: Final answer
    x = 545,478.27

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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.