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Finding the Fourth Proportional to 100,920.75, 139,270.64 and 56,208.75

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Solution

The fourth proportional to 100,920.75, 139,270.64 and 56,208.75 is: 77,568.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,920.75 : 139,270.64 = 56,208.75 : x
  2. Step 2: Convert to fraction form
    100,920.75/139,270.64 = 56,208.75/x
  3. Step 3: Cross multiply
    100,920.75x = 139,270.64 × 56,208.75
  4. Step 4: Simplify right side
    100,920.75x = 7,828,228,305.06
  5. Step 5: Solve for x
    x = 7,828,228,305.06/100,920.75
  6. Step 6: Final answer
    x = 77,568.08

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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.