Home / 642,140.07-886,159.83-387,442.05

Finding the Fourth Proportional to 642,140.07, 886,159.83 and 387,442.05

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Solution

The fourth proportional to 642,140.07, 886,159.83 and 387,442.05 is: 534,673.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,140.07 : 886,159.83 = 387,442.05 : x
  2. Step 2: Convert to fraction form
    642,140.07/886,159.83 = 387,442.05/x
  3. Step 3: Cross multiply
    642,140.07x = 886,159.83 × 387,442.05
  4. Step 4: Simplify right side
    642,140.07x = 343,335,581,162.85
  5. Step 5: Solve for x
    x = 343,335,581,162.85/642,140.07
  6. Step 6: Final answer
    x = 534,673.97

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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.