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Finding the Fourth Proportional to 426,707.70, 640,150.65 and 142,386.90

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Solution

The fourth proportional to 426,707.70, 640,150.65 and 142,386.90 is: 213,610.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,707.70 : 640,150.65 = 142,386.90 : x
  2. Step 2: Convert to fraction form
    426,707.70/640,150.65 = 142,386.90/x
  3. Step 3: Cross multiply
    426,707.70x = 640,150.65 × 142,386.90
  4. Step 4: Simplify right side
    426,707.70x = 91,149,066,586.49
  5. Step 5: Solve for x
    x = 91,149,066,586.49/426,707.70
  6. Step 6: Final answer
    x = 213,610.08

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1.5x scale

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.