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Finding the Fourth Proportional to 281,254.34, 388,128.70 and 153,929.64

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Solution

The fourth proportional to 281,254.34, 388,128.70 and 153,929.64 is: 212,421.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,254.34 : 388,128.70 = 153,929.64 : x
  2. Step 2: Convert to fraction form
    281,254.34/388,128.70 = 153,929.64/x
  3. Step 3: Cross multiply
    281,254.34x = 388,128.70 × 153,929.64
  4. Step 4: Simplify right side
    281,254.34x = 59,744,511,064.67
  5. Step 5: Solve for x
    x = 59,744,511,064.67/281,254.34
  6. Step 6: Final answer
    x = 212,421.65

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1.5x scale

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.