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Finding the Fourth Proportional to 520,780.88, 718,643.60 and 291,298.40

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Solution

The fourth proportional to 520,780.88, 718,643.60 and 291,298.40 is: 401,972.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,780.88 : 718,643.60 = 291,298.40 : x
  2. Step 2: Convert to fraction form
    520,780.88/718,643.60 = 291,298.40/x
  3. Step 3: Cross multiply
    520,780.88x = 718,643.60 × 291,298.40
  4. Step 4: Simplify right side
    520,780.88x = 209,339,730,850.24
  5. Step 5: Solve for x
    x = 209,339,730,850.24/520,780.88
  6. Step 6: Final answer
    x = 401,972.77

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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.