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Finding the Fourth Proportional to 103,712.40, 143,078.40 and 79,801.20

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Solution

The fourth proportional to 103,712.40, 143,078.40 and 79,801.20 is: 110,091.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,712.40 : 143,078.40 = 79,801.20 : x
  2. Step 2: Convert to fraction form
    103,712.40/143,078.40 = 79,801.20/x
  3. Step 3: Cross multiply
    103,712.40x = 143,078.40 × 79,801.20
  4. Step 4: Simplify right side
    103,712.40x = 11,417,828,014.08
  5. Step 5: Solve for x
    x = 11,417,828,014.08/103,712.40
  6. Step 6: Final answer
    x = 110,091.25

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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.