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Finding the Fourth Proportional to 390,769.61, 539,297.88 and 245,598.98

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Solution

The fourth proportional to 390,769.61, 539,297.88 and 245,598.98 is: 338,949.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,769.61 : 539,297.88 = 245,598.98 : x
  2. Step 2: Convert to fraction form
    390,769.61/539,297.88 = 245,598.98/x
  3. Step 3: Cross multiply
    390,769.61x = 539,297.88 × 245,598.98
  4. Step 4: Simplify right side
    390,769.61x = 132,451,009,244.16
  5. Step 5: Solve for x
    x = 132,451,009,244.16/390,769.61
  6. Step 6: Final answer
    x = 338,949.10

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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.