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Finding the Fourth Proportional to 100,920.25, 139,269.95 and 56,208.25

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Solution

The fourth proportional to 100,920.25, 139,269.95 and 56,208.25 is: 77,567.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,920.25 : 139,269.95 = 56,208.25 : x
  2. Step 2: Convert to fraction form
    100,920.25/139,269.95 = 56,208.25/x
  3. Step 3: Cross multiply
    100,920.25x = 139,269.95 × 56,208.25
  4. Step 4: Simplify right side
    100,920.25x = 7,828,120,167.09
  5. Step 5: Solve for x
    x = 7,828,120,167.09/100,920.25
  6. Step 6: Final answer
    x = 77,567.39

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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.