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Finding the Fourth Proportional to 191,143.40, 286,749.60 and 78,762.20

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Solution

The fourth proportional to 191,143.40, 286,749.60 and 78,762.20 is: 118,157.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,143.40 : 286,749.60 = 78,762.20 : x
  2. Step 2: Convert to fraction form
    191,143.40/286,749.60 = 78,762.20/x
  3. Step 3: Cross multiply
    191,143.40x = 286,749.60 × 78,762.20
  4. Step 4: Simplify right side
    191,143.40x = 22,585,029,345.12
  5. Step 5: Solve for x
    x = 22,585,029,345.12/191,143.40
  6. Step 6: Final answer
    x = 118,157.52

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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.