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Finding the Fourth Proportional to 61,390.88, 91,638.13 and 52,681.76

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Solution

The fourth proportional to 61,390.88, 91,638.13 and 52,681.76 is: 78,638.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,390.88 : 91,638.13 = 52,681.76 : x
  2. Step 2: Convert to fraction form
    61,390.88/91,638.13 = 52,681.76/x
  3. Step 3: Cross multiply
    61,390.88x = 91,638.13 × 52,681.76
  4. Step 4: Simplify right side
    61,390.88x = 4,827,657,971.51
  5. Step 5: Solve for x
    x = 4,827,657,971.51/61,390.88
  6. Step 6: Final answer
    x = 78,638.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.