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Finding the Fourth Proportional to 660,786.75, 911,886.53 and 358,980.75

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Solution

The fourth proportional to 660,786.75, 911,886.53 and 358,980.75 is: 495,393.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,786.75 : 911,886.53 = 358,980.75 : x
  2. Step 2: Convert to fraction form
    660,786.75/911,886.53 = 358,980.75/x
  3. Step 3: Cross multiply
    660,786.75x = 911,886.53 × 358,980.75
  4. Step 4: Simplify right side
    660,786.75x = 327,349,708,659.39
  5. Step 5: Solve for x
    x = 327,349,708,659.39/660,786.75
  6. Step 6: Final answer
    x = 495,393.88

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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.