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Finding the Fourth Proportional to 402,915.48, 556,011.72 and 221,627.40

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Solution

The fourth proportional to 402,915.48, 556,011.72 and 221,627.40 is: 305,839.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,915.48 : 556,011.72 = 221,627.40 : x
  2. Step 2: Convert to fraction form
    402,915.48/556,011.72 = 221,627.40/x
  3. Step 3: Cross multiply
    402,915.48x = 556,011.72 × 221,627.40
  4. Step 4: Simplify right side
    402,915.48x = 123,227,431,873.13
  5. Step 5: Solve for x
    x = 123,227,431,873.13/402,915.48
  6. Step 6: Final answer
    x = 305,839.41

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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.