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Finding the Fourth Proportional to 90,970.40, 136,289.34 and 65,948.42

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Solution

The fourth proportional to 90,970.40, 136,289.34 and 65,948.42 is: 98,802.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,970.40 : 136,289.34 = 65,948.42 : x
  2. Step 2: Convert to fraction form
    90,970.40/136,289.34 = 65,948.42/x
  3. Step 3: Cross multiply
    90,970.40x = 136,289.34 × 65,948.42
  4. Step 4: Simplify right side
    90,970.40x = 8,988,066,635.84
  5. Step 5: Solve for x
    x = 8,988,066,635.84/90,970.40
  6. Step 6: Final answer
    x = 98,802.10

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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.