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Finding the Fourth Proportional to 205,386.40, 308,079.60 and 57,642.40

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Solution

The fourth proportional to 205,386.40, 308,079.60 and 57,642.40 is: 86,463.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,386.40 : 308,079.60 = 57,642.40 : x
  2. Step 2: Convert to fraction form
    205,386.40/308,079.60 = 57,642.40/x
  3. Step 3: Cross multiply
    205,386.40x = 308,079.60 × 57,642.40
  4. Step 4: Simplify right side
    205,386.40x = 17,758,447,535.04
  5. Step 5: Solve for x
    x = 17,758,447,535.04/205,386.40
  6. Step 6: Final answer
    x = 86,463.60

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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.