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Finding the Fourth Proportional to 528,038.40, 790,891.20 and 278,428.80

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Solution

The fourth proportional to 528,038.40, 790,891.20 and 278,428.80 is: 417,028.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,038.40 : 790,891.20 = 278,428.80 : x
  2. Step 2: Convert to fraction form
    528,038.40/790,891.20 = 278,428.80/x
  3. Step 3: Cross multiply
    528,038.40x = 790,891.20 × 278,428.80
  4. Step 4: Simplify right side
    528,038.40x = 220,206,887,746.56
  5. Step 5: Solve for x
    x = 220,206,887,746.56/528,038.40
  6. Step 6: Final answer
    x = 417,028.17

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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.