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Finding the Fourth Proportional to 128,970.30, 193,455.45 and 113,418.30

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Solution

The fourth proportional to 128,970.30, 193,455.45 and 113,418.30 is: 170,127.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,970.30 : 193,455.45 = 113,418.30 : x
  2. Step 2: Convert to fraction form
    128,970.30/193,455.45 = 113,418.30/x
  3. Step 3: Cross multiply
    128,970.30x = 193,455.45 × 113,418.30
  4. Step 4: Simplify right side
    128,970.30x = 21,941,388,264.74
  5. Step 5: Solve for x
    x = 21,941,388,264.74/128,970.30
  6. Step 6: Final answer
    x = 170,127.45

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1.5x scale

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.