Finding the Fourth Proportional to 810.17, 1,215.25 and 665.58
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Solution
The fourth proportional to 810.17, 1,215.25 and 665.58 is: 998.37
Step by Step Solution
- Step 1: Write the proportion equation
810.17 : 1,215.25 = 665.58 : x - Step 2: Convert to fraction form
810.17/1,215.25 = 665.58/x - Step 3: Cross multiply
810.17x = 1,215.25 × 665.58 - Step 4: Simplify right side
810.17x = 808,848.99 - Step 5: Solve for x
x = 808,848.99/810.17 - Step 6: Final answer
x = 998.37
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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.