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Finding the Fourth Proportional to 393,340.81, 542,801.31 and 240,378.40

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Solution

The fourth proportional to 393,340.81, 542,801.31 and 240,378.40 is: 331,716.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,340.81 : 542,801.31 = 240,378.40 : x
  2. Step 2: Convert to fraction form
    393,340.81/542,801.31 = 240,378.40/x
  3. Step 3: Cross multiply
    393,340.81x = 542,801.31 × 240,378.40
  4. Step 4: Simplify right side
    393,340.81x = 130,477,710,415.70
  5. Step 5: Solve for x
    x = 130,477,710,415.70/393,340.81
  6. Step 6: Final answer
    x = 331,716.69

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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.