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Finding the Fourth Proportional to 90,406.45, 124,736.18 and 56,420.40

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Solution

The fourth proportional to 90,406.45, 124,736.18 and 56,420.40 is: 77,844.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,406.45 : 124,736.18 = 56,420.40 : x
  2. Step 2: Convert to fraction form
    90,406.45/124,736.18 = 56,420.40/x
  3. Step 3: Cross multiply
    90,406.45x = 124,736.18 × 56,420.40
  4. Step 4: Simplify right side
    90,406.45x = 7,037,665,170.07
  5. Step 5: Solve for x
    x = 7,037,665,170.07/90,406.45
  6. Step 6: Final answer
    x = 77,844.72

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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.