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Finding the Fourth Proportional to 390,180.40, 538,492.65 and 220,425.46

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Solution

The fourth proportional to 390,180.40, 538,492.65 and 220,425.46 is: 304,211.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,180.40 : 538,492.65 = 220,425.46 : x
  2. Step 2: Convert to fraction form
    390,180.40/538,492.65 = 220,425.46/x
  3. Step 3: Cross multiply
    390,180.40x = 538,492.65 × 220,425.46
  4. Step 4: Simplify right side
    390,180.40x = 118,697,490,082.87
  5. Step 5: Solve for x
    x = 118,697,490,082.87/390,180.40
  6. Step 6: Final answer
    x = 304,211.82

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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.