Finding the Fourth Proportional to 156.47, 215.83 and 139.19
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Solution
The fourth proportional to 156.47, 215.83 and 139.19 is: 191.99
Step by Step Solution
- Step 1: Write the proportion equation
156.47 : 215.83 = 139.19 : x - Step 2: Convert to fraction form
156.47/215.83 = 139.19/x - Step 3: Cross multiply
156.47x = 215.83 × 139.19 - Step 4: Simplify right side
156.47x = 30,040.47 - Step 5: Solve for x
x = 30,040.47/156.47 - Step 6: Final answer
x = 191.99
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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.