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Finding the Fourth Proportional to 620,105.60, 855,516.12 and 390,601.28

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Solution

The fourth proportional to 620,105.60, 855,516.12 and 390,601.28 is: 538,885.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,105.60 : 855,516.12 = 390,601.28 : x
  2. Step 2: Convert to fraction form
    620,105.60/855,516.12 = 390,601.28/x
  3. Step 3: Cross multiply
    620,105.60x = 855,516.12 × 390,601.28
  4. Step 4: Simplify right side
    620,105.60x = 334,165,691,532.63
  5. Step 5: Solve for x
    x = 334,165,691,532.63/620,105.60
  6. Step 6: Final answer
    x = 538,885.14

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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.