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Finding the Fourth Proportional to 390,561.84, 538,685.90 and 275,720.76

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Solution

The fourth proportional to 390,561.84, 538,685.90 and 275,720.76 is: 380,290.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,561.84 : 538,685.90 = 275,720.76 : x
  2. Step 2: Convert to fraction form
    390,561.84/538,685.90 = 275,720.76/x
  3. Step 3: Cross multiply
    390,561.84x = 538,685.90 × 275,720.76
  4. Step 4: Simplify right side
    390,561.84x = 148,526,885,749.28
  5. Step 5: Solve for x
    x = 148,526,885,749.28/390,561.84
  6. Step 6: Final answer
    x = 380,290.32

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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.