Finding the Fourth Proportional to 987.99, 1,362.99 and 615.12
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Solution
The fourth proportional to 987.99, 1,362.99 and 615.12 is: 848.59
Step by Step Solution
- Step 1: Write the proportion equation
987.99 : 1,362.99 = 615.12 : x - Step 2: Convert to fraction form
987.99/1,362.99 = 615.12/x - Step 3: Cross multiply
987.99x = 1,362.99 × 615.12 - Step 4: Simplify right side
987.99x = 838,395.59 - Step 5: Solve for x
x = 838,395.59/987.99 - Step 6: Final answer
x = 848.59
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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.