Home / 680,916.52-939,628.80-390,513.10

Finding the Fourth Proportional to 680,916.52, 939,628.80 and 390,513.10

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Solution

The fourth proportional to 680,916.52, 939,628.80 and 390,513.10 is: 538,887.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,916.52 : 939,628.80 = 390,513.10 : x
  2. Step 2: Convert to fraction form
    680,916.52/939,628.80 = 390,513.10/x
  3. Step 3: Cross multiply
    680,916.52x = 939,628.80 × 390,513.10
  4. Step 4: Simplify right side
    680,916.52x = 366,937,355,537.28
  5. Step 5: Solve for x
    x = 366,937,355,537.28/680,916.52
  6. Step 6: Final answer
    x = 538,887.43

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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.