Finding the Fourth Proportional to 90,651.91, 135,931.13 and 40,689.18
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Solution
The fourth proportional to 90,651.91, 135,931.13 and 40,689.18 is: 61,012.79
Step by Step Solution
- Step 1: Write the proportion equation
90,651.91 : 135,931.13 = 40,689.18 : x - Step 2: Convert to fraction form
90,651.91/135,931.13 = 40,689.18/x - Step 3: Cross multiply
90,651.91x = 135,931.13 × 40,689.18 - Step 4: Simplify right side
90,651.91x = 5,530,926,216.17 - Step 5: Solve for x
x = 5,530,926,216.17/90,651.91 - Step 6: Final answer
x = 61,012.79
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1.5x scale
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.