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Finding the Fourth Proportional to 31,373.60, 43,312.08 and 19,431.20

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Solution

The fourth proportional to 31,373.60, 43,312.08 and 19,431.20 is: 26,825.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,373.60 : 43,312.08 = 19,431.20 : x
  2. Step 2: Convert to fraction form
    31,373.60/43,312.08 = 19,431.20/x
  3. Step 3: Cross multiply
    31,373.60x = 43,312.08 × 19,431.20
  4. Step 4: Simplify right side
    31,373.60x = 841,605,688.90
  5. Step 5: Solve for x
    x = 841,605,688.90/31,373.60
  6. Step 6: Final answer
    x = 26,825.28

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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.