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Finding the Fourth Proportional to 100,965.76, 139,332.15 and 55,643.77

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Solution

The fourth proportional to 100,965.76, 139,332.15 and 55,643.77 is: 76,788.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,965.76 : 139,332.15 = 55,643.77 : x
  2. Step 2: Convert to fraction form
    100,965.76/139,332.15 = 55,643.77/x
  3. Step 3: Cross multiply
    100,965.76x = 139,332.15 × 55,643.77
  4. Step 4: Simplify right side
    100,965.76x = 7,752,966,302.25
  5. Step 5: Solve for x
    x = 7,752,966,302.25/100,965.76
  6. Step 6: Final answer
    x = 76,788.07

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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.