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Finding the Fourth Proportional to 487,390.71, 671,103.86 and 426,621.27

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Solution

The fourth proportional to 487,390.71, 671,103.86 and 426,621.27 is: 587,428.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,390.71 : 671,103.86 = 426,621.27 : x
  2. Step 2: Convert to fraction form
    487,390.71/671,103.86 = 426,621.27/x
  3. Step 3: Cross multiply
    487,390.71x = 671,103.86 × 426,621.27
  4. Step 4: Simplify right side
    487,390.71x = 286,307,178,922.00
  5. Step 5: Solve for x
    x = 286,307,178,922.00/487,390.71
  6. Step 6: Final answer
    x = 587,428.47

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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.