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Finding the Fourth Proportional to 643,186.18, 887,651.40 and 356,798.50

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Solution

The fourth proportional to 643,186.18, 887,651.40 and 356,798.50 is: 492,412.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,186.18 : 887,651.40 = 356,798.50 : x
  2. Step 2: Convert to fraction form
    643,186.18/887,651.40 = 356,798.50/x
  3. Step 3: Cross multiply
    643,186.18x = 887,651.40 × 356,798.50
  4. Step 4: Simplify right side
    643,186.18x = 316,712,688,042.90
  5. Step 5: Solve for x
    x = 316,712,688,042.90/643,186.18
  6. Step 6: Final answer
    x = 492,412.15

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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.