Finding the Fourth Proportional to 99,987.98, 137,991.94 and 56,980.62
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Solution
The fourth proportional to 99,987.98, 137,991.94 and 56,980.62 is: 78,638.12
Step by Step Solution
- Step 1: Write the proportion equation
99,987.98 : 137,991.94 = 56,980.62 : x - Step 2: Convert to fraction form
99,987.98/137,991.94 = 56,980.62/x - Step 3: Cross multiply
99,987.98x = 137,991.94 × 56,980.62 - Step 4: Simplify right side
99,987.98x = 7,862,866,153.75 - Step 5: Solve for x
x = 7,862,866,153.75/99,987.98 - Step 6: Final answer
x = 78,638.12
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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.