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Finding the Fourth Proportional to 65,323.64, 90,148.20 and 39,831.32

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Solution

The fourth proportional to 65,323.64, 90,148.20 and 39,831.32 is: 54,968.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,323.64 : 90,148.20 = 39,831.32 : x
  2. Step 2: Convert to fraction form
    65,323.64/90,148.20 = 39,831.32/x
  3. Step 3: Cross multiply
    65,323.64x = 90,148.20 × 39,831.32
  4. Step 4: Simplify right side
    65,323.64x = 3,590,721,801.62
  5. Step 5: Solve for x
    x = 3,590,721,801.62/65,323.64
  6. Step 6: Final answer
    x = 54,968.18

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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.