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Finding the Fourth Proportional to 390,728.36, 539,050.96 and 245,448.76

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Solution

The fourth proportional to 390,728.36, 539,050.96 and 245,448.76 is: 338,622.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,728.36 : 539,050.96 = 245,448.76 : x
  2. Step 2: Convert to fraction form
    390,728.36/539,050.96 = 245,448.76/x
  3. Step 3: Cross multiply
    390,728.36x = 539,050.96 × 245,448.76
  4. Step 4: Simplify right side
    390,728.36x = 132,309,389,708.81
  5. Step 5: Solve for x
    x = 132,309,389,708.81/390,728.36
  6. Step 6: Final answer
    x = 338,622.44

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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.