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Finding the Fourth Proportional to 18,688.78, 28,032.90 and 5,541.40

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Solution

The fourth proportional to 18,688.78, 28,032.90 and 5,541.40 is: 8,312.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688.78 : 28,032.90 = 5,541.40 : x
  2. Step 2: Convert to fraction form
    18,688.78/28,032.90 = 5,541.40/x
  3. Step 3: Cross multiply
    18,688.78x = 28,032.90 × 5,541.40
  4. Step 4: Simplify right side
    18,688.78x = 155,341,512.06
  5. Step 5: Solve for x
    x = 155,341,512.06/18,688.78
  6. Step 6: Final answer
    x = 8,312.02

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1.5x scale

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.