Home / 105,431.12-145,499.28-57,688.64

Finding the Fourth Proportional to 105,431.12, 145,499.28 and 57,688.64

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Solution

The fourth proportional to 105,431.12, 145,499.28 and 57,688.64 is: 79,612.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,431.12 : 145,499.28 = 57,688.64 : x
  2. Step 2: Convert to fraction form
    105,431.12/145,499.28 = 57,688.64/x
  3. Step 3: Cross multiply
    105,431.12x = 145,499.28 × 57,688.64
  4. Step 4: Simplify right side
    105,431.12x = 8,393,655,584.18
  5. Step 5: Solve for x
    x = 8,393,655,584.18/105,431.12
  6. Step 6: Final answer
    x = 79,612.69

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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.