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Finding the Fourth Proportional to 620,624.78, 856,488.66 and 348,693.20

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Solution

The fourth proportional to 620,624.78, 856,488.66 and 348,693.20 is: 481,211.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,624.78 : 856,488.66 = 348,693.20 : x
  2. Step 2: Convert to fraction form
    620,624.78/856,488.66 = 348,693.20/x
  3. Step 3: Cross multiply
    620,624.78x = 856,488.66 × 348,693.20
  4. Step 4: Simplify right side
    620,624.78x = 298,651,771,619.11
  5. Step 5: Solve for x
    x = 298,651,771,619.11/620,624.78
  6. Step 6: Final answer
    x = 481,211.48

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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.