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Finding the Fourth Proportional to 105,062.90, 145,012.95 and 64,809.68

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Solution

The fourth proportional to 105,062.90, 145,012.95 and 64,809.68 is: 89,453.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,062.90 : 145,012.95 = 64,809.68 : x
  2. Step 2: Convert to fraction form
    105,062.90/145,012.95 = 64,809.68/x
  3. Step 3: Cross multiply
    105,062.90x = 145,012.95 × 64,809.68
  4. Step 4: Simplify right side
    105,062.90x = 9,398,242,160.29
  5. Step 5: Solve for x
    x = 9,398,242,160.29/105,062.90
  6. Step 6: Final answer
    x = 89,453.49

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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.