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Finding the Fourth Proportional to 642,775.13, 887,010.47 and 352,376.76

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Solution

The fourth proportional to 642,775.13, 887,010.47 and 352,376.76 is: 486,269.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,775.13 : 887,010.47 = 352,376.76 : x
  2. Step 2: Convert to fraction form
    642,775.13/887,010.47 = 352,376.76/x
  3. Step 3: Cross multiply
    642,775.13x = 887,010.47 × 352,376.76
  4. Step 4: Simplify right side
    642,775.13x = 312,561,872,474.09
  5. Step 5: Solve for x
    x = 312,561,872,474.09/642,775.13
  6. Step 6: Final answer
    x = 486,269.39

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Double scale
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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.