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Finding the Fourth Proportional to 101,290.36, 139,781.10 and 56,578.36

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Solution

The fourth proportional to 101,290.36, 139,781.10 and 56,578.36 is: 78,078.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,290.36 : 139,781.10 = 56,578.36 : x
  2. Step 2: Convert to fraction form
    101,290.36/139,781.10 = 56,578.36/x
  3. Step 3: Cross multiply
    101,290.36x = 139,781.10 × 56,578.36
  4. Step 4: Simplify right side
    101,290.36x = 7,908,585,397.00
  5. Step 5: Solve for x
    x = 7,908,585,397.00/101,290.36
  6. Step 6: Final answer
    x = 78,078.36

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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.