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Finding the Fourth Proportional to 620,876.16, 857,018.88 and 403,382.40

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Solution

The fourth proportional to 620,876.16, 857,018.88 and 403,382.40 is: 556,804.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,876.16 : 857,018.88 = 403,382.40 : x
  2. Step 2: Convert to fraction form
    620,876.16/857,018.88 = 403,382.40/x
  3. Step 3: Cross multiply
    620,876.16x = 857,018.88 × 403,382.40
  4. Step 4: Simplify right side
    620,876.16x = 345,706,332,659.71
  5. Step 5: Solve for x
    x = 345,706,332,659.71/620,876.16
  6. Step 6: Final answer
    x = 556,804.01

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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.