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Finding the Fourth Proportional to 61,116.76, 91,681.08 and 18,985.51

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Solution

The fourth proportional to 61,116.76, 91,681.08 and 18,985.51 is: 28,480.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,116.76 : 91,681.08 = 18,985.51 : x
  2. Step 2: Convert to fraction form
    61,116.76/91,681.08 = 18,985.51/x
  3. Step 3: Cross multiply
    61,116.76x = 91,681.08 × 18,985.51
  4. Step 4: Simplify right side
    61,116.76x = 1,740,611,602.75
  5. Step 5: Solve for x
    x = 1,740,611,602.75/61,116.76
  6. Step 6: Final answer
    x = 28,480.11

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1.5x scale

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.