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Finding the Fourth Proportional to 74,720.79, 103,111.60 and 40,728.54

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Solution

The fourth proportional to 74,720.79, 103,111.60 and 40,728.54 is: 56,203.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,720.79 : 103,111.60 = 40,728.54 : x
  2. Step 2: Convert to fraction form
    74,720.79/103,111.60 = 40,728.54/x
  3. Step 3: Cross multiply
    74,720.79x = 103,111.60 × 40,728.54
  4. Step 4: Simplify right side
    74,720.79x = 4,199,584,925.06
  5. Step 5: Solve for x
    x = 4,199,584,925.06/74,720.79
  6. Step 6: Final answer
    x = 56,203.70

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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.