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Finding the Fourth Proportional to 102,573.40, 153,860.10 and 81,837.40

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Solution

The fourth proportional to 102,573.40, 153,860.10 and 81,837.40 is: 122,756.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,573.40 : 153,860.10 = 81,837.40 : x
  2. Step 2: Convert to fraction form
    102,573.40/153,860.10 = 81,837.40/x
  3. Step 3: Cross multiply
    102,573.40x = 153,860.10 × 81,837.40
  4. Step 4: Simplify right side
    102,573.40x = 12,591,510,547.74
  5. Step 5: Solve for x
    x = 12,591,510,547.74/102,573.40
  6. Step 6: Final answer
    x = 122,756.10

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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.