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Finding the Fourth Proportional to 390,726.36, 539,048.20 and 245,446.76

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Solution

The fourth proportional to 390,726.36, 539,048.20 and 245,446.76 is: 338,619.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,726.36 : 539,048.20 = 245,446.76 : x
  2. Step 2: Convert to fraction form
    390,726.36/539,048.20 = 245,446.76/x
  3. Step 3: Cross multiply
    390,726.36x = 539,048.20 × 245,446.76
  4. Step 4: Simplify right side
    390,726.36x = 132,307,634,173.83
  5. Step 5: Solve for x
    x = 132,307,634,173.83/390,726.36
  6. Step 6: Final answer
    x = 338,619.68

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1.5x scale

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.