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Finding the Fourth Proportional to 229,085.52, 316,153.80 and 128,490

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Solution

The fourth proportional to 229,085.52, 316,153.80 and 128,490 is: 177,325.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    229,085.52 : 316,153.80 = 128,490 : x
  2. Step 2: Convert to fraction form
    229,085.52/316,153.80 = 128,490/x
  3. Step 3: Cross multiply
    229,085.52x = 316,153.80 × 128,490
  4. Step 4: Simplify right side
    229,085.52x = 40,622,601,762
  5. Step 5: Solve for x
    x = 40,622,601,762/229,085.52
  6. Step 6: Final answer
    x = 177,325.05

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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.