Finding the Fourth Proportional to 390,990.68, 539,566.80 and 212,142.68
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Solution
The fourth proportional to 390,990.68, 539,566.80 and 212,142.68 is: 292,756.71
Step by Step Solution
- Step 1: Write the proportion equation
390,990.68 : 539,566.80 = 212,142.68 : x - Step 2: Convert to fraction form
390,990.68/539,566.80 = 212,142.68/x - Step 3: Cross multiply
390,990.68x = 539,566.80 × 212,142.68 - Step 4: Simplify right side
390,990.68x = 114,465,146,991.02 - Step 5: Solve for x
x = 114,465,146,991.02/390,990.68 - Step 6: Final answer
x = 292,756.71
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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.