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Finding the Fourth Proportional to 260,038.10, 390,057.15 and 126,938.90

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Solution

The fourth proportional to 260,038.10, 390,057.15 and 126,938.90 is: 190,408.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,038.10 : 390,057.15 = 126,938.90 : x
  2. Step 2: Convert to fraction form
    260,038.10/390,057.15 = 126,938.90/x
  3. Step 3: Cross multiply
    260,038.10x = 390,057.15 × 126,938.90
  4. Step 4: Simplify right side
    260,038.10x = 49,513,425,558.14
  5. Step 5: Solve for x
    x = 49,513,425,558.14/260,038.10
  6. Step 6: Final answer
    x = 190,408.35

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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.