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Finding the Fourth Proportional to 389,840.36, 537,981.58 and 217,765.58

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Solution

The fourth proportional to 389,840.36, 537,981.58 and 217,765.58 is: 300,517.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,840.36 : 537,981.58 = 217,765.58 : x
  2. Step 2: Convert to fraction form
    389,840.36/537,981.58 = 217,765.58/x
  3. Step 3: Cross multiply
    389,840.36x = 537,981.58 × 217,765.58
  4. Step 4: Simplify right side
    389,840.36x = 117,153,871,598.56
  5. Step 5: Solve for x
    x = 117,153,871,598.56/389,840.36
  6. Step 6: Final answer
    x = 300,517.55

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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.