Home / 121,999,821.72-168,317,666.96-77,972,592.08

Finding the Fourth Proportional to 121,999,821.72, 168,317,666.96 and 77,972,592.08

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Solution

The fourth proportional to 121,999,821.72, 168,317,666.96 and 77,972,592.08 is: 107,575,278.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,999,821.72 : 168,317,666.96 = 77,972,592.08 : x
  2. Step 2: Convert to fraction form
    121,999,821.72/168,317,666.96 = 77,972,592.08/x
  3. Step 3: Cross multiply
    121,999,821.72x = 168,317,666.96 × 77,972,592.08
  4. Step 4: Simplify right side
    121,999,821.72x = 13,124,164,784,497,924
  5. Step 5: Solve for x
    x = 13,124,164,784,497,924/121,999,821.72
  6. Step 6: Final answer
    x = 107,575,278.39

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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.