Finding the Fourth Proportional to 81,462.78, 121,394.16 and 78,787.08
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Solution
The fourth proportional to 81,462.78, 121,394.16 and 78,787.08 is: 117,406.89
Step by Step Solution
- Step 1: Write the proportion equation
81,462.78 : 121,394.16 = 78,787.08 : x - Step 2: Convert to fraction form
81,462.78/121,394.16 = 78,787.08/x - Step 3: Cross multiply
81,462.78x = 121,394.16 × 78,787.08 - Step 4: Simplify right side
81,462.78x = 9,564,291,395.45 - Step 5: Solve for x
x = 9,564,291,395.45/81,462.78 - Step 6: Final answer
x = 117,406.89
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1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.