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Finding the Fourth Proportional to 139,430.80, 191,968.68 and 118,176.40

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Solution

The fourth proportional to 139,430.80, 191,968.68 and 118,176.40 is: 162,705.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,430.80 : 191,968.68 = 118,176.40 : x
  2. Step 2: Convert to fraction form
    139,430.80/191,968.68 = 118,176.40/x
  3. Step 3: Cross multiply
    139,430.80x = 191,968.68 × 118,176.40
  4. Step 4: Simplify right side
    139,430.80x = 22,686,167,515.15
  5. Step 5: Solve for x
    x = 22,686,167,515.15/139,430.80
  6. Step 6: Final answer
    x = 162,705.57

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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.