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Finding the Fourth Proportional to 145,898.75, 201,340.32 and 78,830.75

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Solution

The fourth proportional to 145,898.75, 201,340.32 and 78,830.75 is: 108,786.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,898.75 : 201,340.32 = 78,830.75 : x
  2. Step 2: Convert to fraction form
    145,898.75/201,340.32 = 78,830.75/x
  3. Step 3: Cross multiply
    145,898.75x = 201,340.32 × 78,830.75
  4. Step 4: Simplify right side
    145,898.75x = 15,871,808,430.84
  5. Step 5: Solve for x
    x = 15,871,808,430.84/145,898.75
  6. Step 6: Final answer
    x = 108,786.46

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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.