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Finding the Fourth Proportional to 157,386.72, 215,971.80 and 143,130.72

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Solution

The fourth proportional to 157,386.72, 215,971.80 and 143,130.72 is: 196,409.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,386.72 : 215,971.80 = 143,130.72 : x
  2. Step 2: Convert to fraction form
    157,386.72/215,971.80 = 143,130.72/x
  3. Step 3: Cross multiply
    157,386.72x = 215,971.80 × 143,130.72
  4. Step 4: Simplify right side
    157,386.72x = 30,912,199,233.70
  5. Step 5: Solve for x
    x = 30,912,199,233.70/157,386.72
  6. Step 6: Final answer
    x = 196,409.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.