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Finding the Fourth Proportional to 643,607.67, 888,341.76 and 439,740.93

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Solution

The fourth proportional to 643,607.67, 888,341.76 and 439,740.93 is: 606,953.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,607.67 : 888,341.76 = 439,740.93 : x
  2. Step 2: Convert to fraction form
    643,607.67/888,341.76 = 439,740.93/x
  3. Step 3: Cross multiply
    643,607.67x = 888,341.76 × 439,740.93
  4. Step 4: Simplify right side
    643,607.67x = 390,640,231,700.24
  5. Step 5: Solve for x
    x = 390,640,231,700.24/643,607.67
  6. Step 6: Final answer
    x = 606,953.97

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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.