Home / 285,985.71-428,981.63-86,307.89

Finding the Fourth Proportional to 285,985.71, 428,981.63 and 86,307.89

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Solution

The fourth proportional to 285,985.71, 428,981.63 and 86,307.89 is: 129,462.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,985.71 : 428,981.63 = 86,307.89 : x
  2. Step 2: Convert to fraction form
    285,985.71/428,981.63 = 86,307.89/x
  3. Step 3: Cross multiply
    285,985.71x = 428,981.63 × 86,307.89
  4. Step 4: Simplify right side
    285,985.71x = 37,024,496,757.61
  5. Step 5: Solve for x
    x = 37,024,496,757.61/285,985.71
  6. Step 6: Final answer
    x = 129,462.75

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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.