Home / 78,493,071.78-117,730,638.39-20,989,828.74

Finding the Fourth Proportional to 78,493,071.78, 117,730,638.39 and 20,989,828.74

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Solution

The fourth proportional to 78,493,071.78, 117,730,638.39 and 20,989,828.74 is: 31,482,344.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,493,071.78 : 117,730,638.39 = 20,989,828.74 : x
  2. Step 2: Convert to fraction form
    78,493,071.78/117,730,638.39 = 20,989,828.74/x
  3. Step 3: Cross multiply
    78,493,071.78x = 117,730,638.39 × 20,989,828.74
  4. Step 4: Simplify right side
    78,493,071.78x = 2,471,145,937,256,969
  5. Step 5: Solve for x
    x = 2,471,145,937,256,969/78,493,071.78
  6. Step 6: Final answer
    x = 31,482,344.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.