Home / 76,415.12-105,448.13-42,421.62

Finding the Fourth Proportional to 76,415.12, 105,448.13 and 42,421.62

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Solution

The fourth proportional to 76,415.12, 105,448.13 and 42,421.62 is: 58,539.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,415.12 : 105,448.13 = 42,421.62 : x
  2. Step 2: Convert to fraction form
    76,415.12/105,448.13 = 42,421.62/x
  3. Step 3: Cross multiply
    76,415.12x = 105,448.13 × 42,421.62
  4. Step 4: Simplify right side
    76,415.12x = 4,473,280,500.57
  5. Step 5: Solve for x
    x = 4,473,280,500.57/76,415.12
  6. Step 6: Final answer
    x = 58,539.21

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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.