Home / 718,000.78-990,821.55-395,710.75

Finding the Fourth Proportional to 718,000.78, 990,821.55 and 395,710.75

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Solution

The fourth proportional to 718,000.78, 990,821.55 and 395,710.75 is: 546,070.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,000.78 : 990,821.55 = 395,710.75 : x
  2. Step 2: Convert to fraction form
    718,000.78/990,821.55 = 395,710.75/x
  3. Step 3: Cross multiply
    718,000.78x = 990,821.55 × 395,710.75
  4. Step 4: Simplify right side
    718,000.78x = 392,078,738,666.66
  5. Step 5: Solve for x
    x = 392,078,738,666.66/718,000.78
  6. Step 6: Final answer
    x = 546,070.07

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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.