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Finding the Fourth Proportional to 105,420.88, 145,490.81 and 57,681.40

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Solution

The fourth proportional to 105,420.88, 145,490.81 and 57,681.40 is: 79,605.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,420.88 : 145,490.81 = 57,681.40 : x
  2. Step 2: Convert to fraction form
    105,420.88/145,490.81 = 57,681.40/x
  3. Step 3: Cross multiply
    105,420.88x = 145,490.81 × 57,681.40
  4. Step 4: Simplify right side
    105,420.88x = 8,392,113,607.93
  5. Step 5: Solve for x
    x = 8,392,113,607.93/105,420.88
  6. Step 6: Final answer
    x = 79,605.80

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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.