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Finding the Fourth Proportional to 520,718.40, 718,557.55 and 291,235.95

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Solution

The fourth proportional to 520,718.40, 718,557.55 and 291,235.95 is: 401,886.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,718.40 : 718,557.55 = 291,235.95 : x
  2. Step 2: Convert to fraction form
    520,718.40/718,557.55 = 291,235.95/x
  3. Step 3: Cross multiply
    520,718.40x = 718,557.55 × 291,235.95
  4. Step 4: Simplify right side
    520,718.40x = 209,269,790,703.92
  5. Step 5: Solve for x
    x = 209,269,790,703.92/520,718.40
  6. Step 6: Final answer
    x = 401,886.68

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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.