Home / 643,421.46-887,918.90-356,941.55

Finding the Fourth Proportional to 643,421.46, 887,918.90 and 356,941.55

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Solution

The fourth proportional to 643,421.46, 887,918.90 and 356,941.55 is: 492,577.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,421.46 : 887,918.90 = 356,941.55 : x
  2. Step 2: Convert to fraction form
    643,421.46/887,918.90 = 356,941.55/x
  3. Step 3: Cross multiply
    643,421.46x = 887,918.90 × 356,941.55
  4. Step 4: Simplify right side
    643,421.46x = 316,935,142,215.99
  5. Step 5: Solve for x
    x = 316,935,142,215.99/643,421.46
  6. Step 6: Final answer
    x = 492,577.82

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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.