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Finding the Fourth Proportional to 402,064.60, 602,878.20 and 165,431.20

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Solution

The fourth proportional to 402,064.60, 602,878.20 and 165,431.20 is: 248,056.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,064.60 : 602,878.20 = 165,431.20 : x
  2. Step 2: Convert to fraction form
    402,064.60/602,878.20 = 165,431.20/x
  3. Step 3: Cross multiply
    402,064.60x = 602,878.20 × 165,431.20
  4. Step 4: Simplify right side
    402,064.60x = 99,734,864,079.84
  5. Step 5: Solve for x
    x = 99,734,864,079.84/402,064.60
  6. Step 6: Final answer
    x = 248,056.81

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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.