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Finding the Fourth Proportional to 287,648.48, 431,403.51 and 87,970.59

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Solution

The fourth proportional to 287,648.48, 431,403.51 and 87,970.59 is: 131,934.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,648.48 : 431,403.51 = 87,970.59 : x
  2. Step 2: Convert to fraction form
    287,648.48/431,403.51 = 87,970.59/x
  3. Step 3: Cross multiply
    287,648.48x = 431,403.51 × 87,970.59
  4. Step 4: Simplify right side
    287,648.48x = 37,950,821,302.77
  5. Step 5: Solve for x
    x = 37,950,821,302.77/287,648.48
  6. Step 6: Final answer
    x = 131,934.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.