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Finding the Fourth Proportional to 292,431.20, 438,646.80 and 70,815.20

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Solution

The fourth proportional to 292,431.20, 438,646.80 and 70,815.20 is: 106,222.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    292,431.20 : 438,646.80 = 70,815.20 : x
  2. Step 2: Convert to fraction form
    292,431.20/438,646.80 = 70,815.20/x
  3. Step 3: Cross multiply
    292,431.20x = 438,646.80 × 70,815.20
  4. Step 4: Simplify right side
    292,431.20x = 31,062,860,871.36
  5. Step 5: Solve for x
    x = 31,062,860,871.36/292,431.20
  6. Step 6: Final answer
    x = 106,222.80

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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.