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Finding the Fourth Proportional to 78,840.70, 118,261.05 and 28,904.20

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Solution

The fourth proportional to 78,840.70, 118,261.05 and 28,904.20 is: 43,356.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,840.70 : 118,261.05 = 28,904.20 : x
  2. Step 2: Convert to fraction form
    78,840.70/118,261.05 = 28,904.20/x
  3. Step 3: Cross multiply
    78,840.70x = 118,261.05 × 28,904.20
  4. Step 4: Simplify right side
    78,840.70x = 3,418,241,041.41
  5. Step 5: Solve for x
    x = 3,418,241,041.41/78,840.70
  6. Step 6: Final answer
    x = 43,356.30

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1.5x scale

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.