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Finding the Fourth Proportional to 292,505.60, 438,643.20 and 105,420.80

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Solution

The fourth proportional to 292,505.60, 438,643.20 and 105,420.80 is: 158,089.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    292,505.60 : 438,643.20 = 105,420.80 : x
  2. Step 2: Convert to fraction form
    292,505.60/438,643.20 = 105,420.80/x
  3. Step 3: Cross multiply
    292,505.60x = 438,643.20 × 105,420.80
  4. Step 4: Simplify right side
    292,505.60x = 46,242,117,058.56
  5. Step 5: Solve for x
    x = 46,242,117,058.56/292,505.60
  6. Step 6: Final answer
    x = 158,089.68

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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.