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Finding the Fourth Proportional to 85,428.63, 117,946.94 and 76,460.58

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Solution

The fourth proportional to 85,428.63, 117,946.94 and 76,460.58 is: 105,565.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,428.63 : 117,946.94 = 76,460.58 : x
  2. Step 2: Convert to fraction form
    85,428.63/117,946.94 = 76,460.58/x
  3. Step 3: Cross multiply
    85,428.63x = 117,946.94 × 76,460.58
  4. Step 4: Simplify right side
    85,428.63x = 9,018,291,059.32
  5. Step 5: Solve for x
    x = 9,018,291,059.32/85,428.63
  6. Step 6: Final answer
    x = 105,565.21

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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.