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Finding the Fourth Proportional to 74,705.76, 103,101.12 and 42,880.32

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Solution

The fourth proportional to 74,705.76, 103,101.12 and 42,880.32 is: 59,178.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,705.76 : 103,101.12 = 42,880.32 : x
  2. Step 2: Convert to fraction form
    74,705.76/103,101.12 = 42,880.32/x
  3. Step 3: Cross multiply
    74,705.76x = 103,101.12 × 42,880.32
  4. Step 4: Simplify right side
    74,705.76x = 4,421,009,017.96
  5. Step 5: Solve for x
    x = 4,421,009,017.96/74,705.76
  6. Step 6: Final answer
    x = 59,178.96

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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.