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Finding the Fourth Proportional to 66,688.86, 92,020.41 and 38,389.08

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Solution

The fourth proportional to 66,688.86, 92,020.41 and 38,389.08 is: 52,971.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,688.86 : 92,020.41 = 38,389.08 : x
  2. Step 2: Convert to fraction form
    66,688.86/92,020.41 = 38,389.08/x
  3. Step 3: Cross multiply
    66,688.86x = 92,020.41 × 38,389.08
  4. Step 4: Simplify right side
    66,688.86x = 3,532,578,881.12
  5. Step 5: Solve for x
    x = 3,532,578,881.12/66,688.86
  6. Step 6: Final answer
    x = 52,971.05

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1.5x scale

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.