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Finding the Fourth Proportional to 131,610, 197,428.80 and 42,870.40

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Solution

The fourth proportional to 131,610, 197,428.80 and 42,870.40 is: 64,310.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,610 : 197,428.80 = 42,870.40 : x
  2. Step 2: Convert to fraction form
    131,610/197,428.80 = 42,870.40/x
  3. Step 3: Cross multiply
    131,610x = 197,428.80 × 42,870.40
  4. Step 4: Simplify right side
    131,610x = 8,463,851,627.52
  5. Step 5: Solve for x
    x = 8,463,851,627.52/131,610
  6. Step 6: Final answer
    x = 64,310.10

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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.