Home / 18,971.12-28,457.10-4,931.70

Finding the Fourth Proportional to 18,971.12, 28,457.10 and 4,931.70

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Solution

The fourth proportional to 18,971.12, 28,457.10 and 4,931.70 is: 7,397.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,971.12 : 28,457.10 = 4,931.70 : x
  2. Step 2: Convert to fraction form
    18,971.12/28,457.10 = 4,931.70/x
  3. Step 3: Cross multiply
    18,971.12x = 28,457.10 × 4,931.70
  4. Step 4: Simplify right side
    18,971.12x = 140,341,880.07
  5. Step 5: Solve for x
    x = 140,341,880.07/18,971.12
  6. Step 6: Final answer
    x = 7,397.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.