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Finding the Fourth Proportional to 521,657.60, 782,486.40 and 518,547.20

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Solution

The fourth proportional to 521,657.60, 782,486.40 and 518,547.20 is: 777,820.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,657.60 : 782,486.40 = 518,547.20 : x
  2. Step 2: Convert to fraction form
    521,657.60/782,486.40 = 518,547.20/x
  3. Step 3: Cross multiply
    521,657.60x = 782,486.40 × 518,547.20
  4. Step 4: Simplify right side
    521,657.60x = 405,756,131,758.08
  5. Step 5: Solve for x
    x = 405,756,131,758.08/521,657.60
  6. Step 6: Final answer
    x = 777,820.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.